I am having the same problem (ps4)
I bought the hardened edition and tried to use the code for the season pass, it says thank you for entering your code and nothing downloads.
I do not see anything in the in-game store and am getting sick of it.
On every forum activision gives you advice and nothing works.
I want my season pass or my money back.
Thanks for posting! We are aware that some Playstation players are having difficulty receiving their DLC. Please try the following Issues downloading content from the Library
and let us know if that helps! Also, please be aware of this Sony Entertainment Network - Service Status